package com.mcc.system.service.impl;

import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;

import cn.hutool.core.util.ObjectUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.mcc.common.constant.UserConstants;
import com.mcc.common.core.domain.TreeSelect;
import com.mcc.common.core.domain.entity.SysDept;
import com.mcc.common.exception.CustomException;
import com.mcc.common.utils.StringUtils;
import com.mcc.system.mapper.SysDeptMapper;
import com.mcc.system.service.ISysDeptService;

/**
 * 部门管理 服务实现
 *
 * @author gxy
 */
@Service
public class SysDeptServiceImpl implements ISysDeptService {

    @Autowired
    private SysDeptMapper deptMapper;

    /**
     * 查询部门管理数据
     *
     * @param dept 部门信息
     * @return 部门信息集合
     */
    @Override
    public List<SysDept> selectDeptList(SysDept dept) {
        QueryWrapper queryWrapper = new QueryWrapper();
        if (ObjectUtil.isNotEmpty(dept)) {
            queryWrapper.eq(ObjectUtil.isNotEmpty(dept.getParentId()), "parent_id", dept.getParentId());
            queryWrapper.like(ObjectUtil.isNotEmpty(dept.getDeptName()), "dept_name", dept.getDeptName());
            queryWrapper.eq(ObjectUtil.isNotEmpty(dept.getStatus()), "status", dept.getStatus());
        }
        queryWrapper.orderByAsc("parent_id", "order_num");
        return deptMapper.selectList(queryWrapper);
    }

    /**
     * 构建前端所需要树结构
     *
     * @param depts 部门列表
     * @return 树结构列表
     */
    @Override
    public List<SysDept> buildDeptTree(List<SysDept> depts) {
        List<SysDept> returnList = new ArrayList<>();
        List<Long> tempList = new ArrayList<>();
        for (SysDept dept : depts) {
            tempList.add(dept.getDeptId());
        }
        for (Iterator<SysDept> iterator = depts.iterator(); iterator.hasNext(); ) {
            SysDept dept = iterator.next();
            // 如果是顶级节点, 遍历该父节点的所有子节点
            if (!tempList.contains(dept.getParentId())) {
                recursionFn(depts, dept);
                returnList.add(dept);
            }
        }
        if (returnList.isEmpty()) {
            returnList = depts;
        }
        return returnList;
    }

    /**
     * 构建前端所需要下拉树结构
     *
     * @param depts 部门列表
     * @return 下拉树结构列表
     */
    @Override
    public List<TreeSelect> buildDeptTreeSelect(List<SysDept> depts) {
        List<SysDept> deptTrees = buildDeptTree(depts);
        return deptTrees.stream().map(TreeSelect::new).collect(Collectors.toList());
    }

    /**
     * 根据部门ID查询信息
     *
     * @param deptId 部门ID
     * @return 部门信息
     */
    @Override
    public SysDept selectDeptById(Long deptId) {
        return deptMapper.selectById(deptId);
    }

    /**
     * 根据ID查询所有子部门（正常状态）
     *
     * @param deptId 部门ID
     * @return 子部门数
     */
    @Override
    public int countNormalChildrenDeptById(Long deptId) {
        QueryWrapper queryWrapper = new QueryWrapper();
        queryWrapper.having("find_in_set({0}, ancestors)", deptId);
        queryWrapper.eq("status", 0);
        return deptMapper.selectCount(queryWrapper);
    }

    /**
     * 是否存在子节点
     *
     * @param deptId 部门ID
     * @return 结果
     */
    @Override
    public boolean hasChildByDeptId(Long deptId) {
        QueryWrapper queryWrapper = new QueryWrapper();
        queryWrapper.eq("parent_id", deptId);
        return deptMapper.selectCount(queryWrapper) > 0;
    }

    /**
     * 校验部门名称是否唯一
     *
     * @param dept 部门信息
     * @return 结果
     */
    @Override
    public boolean checkDeptNameUnique(SysDept dept) {
        QueryWrapper queryWrapper = new QueryWrapper();
        queryWrapper.eq("dept_name", dept.getDeptName());
        queryWrapper.ne(ObjectUtil.isNotEmpty(dept.getDeptId()), "dept_id", dept.getDeptId());
        return deptMapper.selectCount(queryWrapper) == 0;
    }

    /**
     * 新增部门信息
     *
     * @param dept 部门信息
     * @return 结果
     */
    @Override
    public int insertDept(SysDept dept) {
        SysDept parentDept = selectDeptById(dept.getParentId());
        // 如果父节点不为正常状态,则不允许新增子节点
        if (UserConstants.DEPT_DISABLE.equals(parentDept.getStatus())) {
            throw new CustomException("部门停用，不允许新增");
        }
        dept.setAncestors(parentDept.getAncestors() + "," + dept.getParentId());
        return deptMapper.insert(dept);
    }

    /**
     * 修改部门信息
     *
     * @param dept 部门信息
     * @return 结果
     */
    @Override
    public int updateDept(SysDept dept) {
        SysDept newParentDept = selectDeptById(dept.getParentId());
        SysDept oldDept = selectDeptById(dept.getDeptId());
        if (ObjectUtil.isNotEmpty(newParentDept) && ObjectUtil.isNotEmpty(oldDept)) {
            String newAncestors = newParentDept.getAncestors() + "," + newParentDept.getDeptId();
            String oldAncestors = oldDept.getAncestors();
            dept.setAncestors(newAncestors);
            updateDeptChildren(dept.getDeptId(), newAncestors, oldAncestors);
        }
        int result = deptMapper.updateById(dept);
        if (UserConstants.DEPT_NORMAL.equals(dept.getStatus())) {
            // 如果该部门是启用状态，则启用该部门的所有上级部门
            QueryWrapper queryWrapper = new QueryWrapper();
            queryWrapper.inSql("dept_id", dept.getAncestors());
            SysDept deptUpdate = new SysDept();
            deptUpdate.setStatus(dept.getStatus());
            deptUpdate.setUpdateBy(dept.getUpdateBy());
            deptUpdate.setUpdateTime(new Date());
            deptMapper.update(deptUpdate, queryWrapper);
        }
        return result;
    }

    /**
     * 修改子元素关系
     *
     * @param deptId       被修改的部门ID
     * @param newAncestors 新的父ID集合
     * @param oldAncestors 旧的父ID集合
     */
    public void updateDeptChildren(Long deptId, String newAncestors, String oldAncestors) {
        QueryWrapper queryWrapper = new QueryWrapper();
        queryWrapper.having("find_in_set({0}, ancestors)", deptId);
        List<SysDept> children = deptMapper.selectList(queryWrapper);
        for (SysDept child : children) {
            child.setAncestors(child.getAncestors().replace(oldAncestors, newAncestors));
        }
        if (children.size() > 0) {
            deptMapper.updateDeptChildren(children);
        }
    }

    /**
     * 删除部门管理信息
     *
     * @param deptId 部门ID
     * @return 结果
     */
    @Override
    public int deleteDeptById(Long deptId) {
        return deptMapper.deleteById(deptId);
    }

    /**
     * 递归列表
     */
    private void recursionFn(List<SysDept> list, SysDept t) {
        // 得到子节点列表
        List<SysDept> childList = getChildList(list, t);
        t.setChildren(childList);
        for (SysDept tChild : childList) {
            if (hasChild(list, tChild)) {
                recursionFn(list, tChild);
            }
        }
    }

    /**
     * 得到子节点列表
     */
    private List<SysDept> getChildList(List<SysDept> list, SysDept t) {
        List<SysDept> tlist = new ArrayList<>();
        Iterator<SysDept> it = list.iterator();
        while (it.hasNext()) {
            SysDept n = it.next();
            if (StringUtils.isNotNull(n.getParentId()) && n.getParentId().longValue() == t.getDeptId().longValue()) {
                tlist.add(n);
            }
        }
        return tlist;
    }

    /**
     * 判断是否有子节点
     */
    private boolean hasChild(List<SysDept> list, SysDept t) {
        return getChildList(list, t).size() > 0 ? true : false;
    }
}
